<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
</head>
<body>
    <div id="app">
<p>{{usename}}</p>
<p>{{usename.toUpperCase()}}</p>
<p>{{usename+'你好'}}</p>
<p>{{age >= 18 ? '成年' :'未成年'}}</p>
<p>{{friend.name}}</p>
<p>{{friend.age}}</p>
    </div>
    <script>
        const app = new Vue({
            el:'#app',
            data:{
                usename:'tony',
                age:'19',
                friend:{
                    name:'zhangzhen',
                    age:'24'
                }
            }
        })
    </script>
</body>
</html>